linux-kernel - Re: SIGHUP on connect

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Date:   Fri, 30 Oct 2020 15:22:52 +0100
From:   "Michael J. Baars" <mjbaars1977.linux-kernel@...erfiber.eu>
To:     Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
        linux-kernel@...r.kernel.org
Subject: Re: SIGHUP on connect

Here, think I got it :)

Just run 'make; make run'

Thank you for your help.

On Thu, 2020-10-29 at 21:48 +0100, Bernd Petrovitsch wrote:
> Hi all!
> 
> On 29/10/2020 14:10, Michael J. Baars wrote:
> [...] 
> > According to manual page socket(7), SO_REUSEADDR allows for local addresses to be reused for binding. I've tested this socket option with the WAN address,
> > it
> > appears the problem is solved for both local and non-local connections.
> 
> Yup.
> 
> > I also found the the SO_LINGER socket option to be useful in some way. By default, SO_LINGER is set to 0, so you would think that lingering connections were
> > out
> > of the question. However, an enabled linger with a l_onoff = 1 and a l_linger = 0 seems to work a lot better than a disabled linger with a l_onoff = 0 and a
> > l_linger = 0.
> > 
> > Which option would you use?
> 
> I never used SO_LINGER before.
> 
> From the description in `man 7 socket`, active SO_LINGER just
> makes shutdown() to block if not all data has been transmitted
> (and ACKed?).
> close() on a socket calls shutdown() automatically (unless
> the shutdown() has been already called).
> 
> The timeout which you're application runs into
> applies after shutting down/closing the connection.
> 
> MfG,
> 	Bernd

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